<template>
  <div>
    <!-- 面包屑导航区  -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="请按步骤详细添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 添加步骤 条区域-->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- Tab栏区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
        class="goods-form"
      >
        <el-tabs
          v-model="activeIndex"
          :tab-position="tabPosition"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>

            <el-form-item label="商品价格(元)" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>

            <el-form-item label="商品重量(Kg)" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>

            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>

            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cateProps"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTabData"
              :key="item.attr_id"
            >
              <!-- 复选框 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  border
                  :label="arg"
                  v-for="(arg, i) in item.attr_vals"
                  :key="i"
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- 提示区域 -->
            <el-alert
              title="只能上传 jpg/png/jpeg 格式文件，且不超过 5MB！"
              type="warning"
              center
              show-icon
              :closable="false"
              style="margin-bottom: 8px"
            >
            </el-alert>
            <!-- action表示图片要上传的后台API地址 -->
            <!-- list-type 规定图片的展示方式 -->
            <!-- headers 设置上传的请求头部，让服务器端返回一个有效的 token 值 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
              :before-upload="beforeAvatarUpload"
              accept=".jpg,.jpeg,.png"
              multiple
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"> </quill-editor>

            <!-- 添加商品按钮 -->
            <el-button class="btnAdd" type="primary" @click="addGoods"
              >添加商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览对话框 -->
    <el-dialog
      title="预览图片"
      :visible.sync="previewDialogVisible"
      width="50%"
    >
      <img class="previewImg" :src="previewPath" alt="点击预览" />
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //商品数据列表
      cateList: [],
      //动态参数的数据
      manyTabData: [],
      //静态属性数据
      onlyTableData: [],
      //步骤条激活索引值
      activeIndex: "0",
      //指定 Tab 栏标签所在的位置
      tabPosition: "left",
      //添加商品的表单数据对象
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        //图片数组
        pics: [],
        //商品详情描述
        goods_introduce: "",
        attrs: [],
      },
      //表单的验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: "请输入商品名称", trigger: "blur" },
        ],
        goods_price: [
          { required: true, message: "请输入商品价格", trigger: "blur" },
        ],
        goods_weight: [
          { required: true, message: "请输入商品重量", trigger: "blur" },
        ],
        goods_number: [
          { required: true, message: "请输入商品数量", trigger: "blur" },
        ],
        goods_cat: [
          { required: true, message: "请选择商品的分类", trigger: "blur" },
        ],
      },
      cateProps: {
        expandTrigger: "hover",
        label: "cat_name",
        value: "cat_id",
        children: "children",
      },
      //上传图片的URL地址
      uploadURL: "http://127.0.0.1:8888/api/private/v1/upload",
      //图片上传组件的请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem("token"),
      },
      //预览图片路径
      previewPath: "",
      //控制图片预览对话框的显示与隐藏
      previewDialogVisible: false,
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品数据失败！");
      }
      this.cateList = res.data;
      //console.log(this.cateList);
    },
    //判断表单的校验是否通过
    // formValidate() {
    //   let p = new Promise((resolve, reject) => {
    //     this.$refs.addFormRef.validate(async (valid) => {
    //       valid ? resolve() : reject();
    //     });
    //   });
    //   return p;
    // },
    //阻止 Tag 标签的切换
    // async beforeTabLeave() {
    //   return await this.formValidate();
    // },
    beforeTabLeave(newActiveName, oldActiveName) {
      if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请完善商品信息！");
        return false;
      }
    },
    //tab 被选中时触发
    async tabClicked() {
      //console.log(this.activeIndex);
      //证明访问的是动态参数的面板，获取动态参数数据
      if (this.activeIndex === "1") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: "many" } }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("获取参数失败！");
        }
        //console.log(res);
        //将data中的attr_vals中的字符串数据转换为数组对象
        res.data.forEach((item) => {
          item.attr_vals =
            item.attr_vals === 0 ? [] : item.attr_vals.split(" ");
        });
        this.$message.success("获取商品参数成功！");
        this.manyTabData = res.data;
      } else if (this.activeIndex === "2") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: "only" } }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("获取属性失败!");
        }
        //console.log(res);
        this.onlyTableData = res.data;
        this.$message.success("获取商品属性成功！");
      }
    },
    //处理上传图片时的限制
    beforeAvatarUpload(file) {
      //console.log(file);
      let types = ["image/jpeg", "image/jpg", "image/png"];
      const isImage = types.includes(file.type);
      if (!isImage) {
        return this.$message.error("上传图片只能是 JPG、JPEG、PNG 格式!");
      }

      const isLtSize = file.size / 1024 / 1024 < 5;
      if (!isLtSize) {
        return this.$message.error("上传图片大小不能超过 5MB!");
      }
    },
    //处理图片预览效果
    handlePreview(file) {
      console.log(file);
      this.previewPath = file.response.data.url;
      this.previewDialogVisible = true;
    },
    //删除图片事件
    handleRemove(file) {
      //console.log(file);
      //1、获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path;
      //2、从 pics 数组中找到这个图片的对应的缩影值
      const remFileIndex = this.addForm.pics.findIndex(
        (item) => item.pic === filePath
      );
      //3、调用数组 splice 方法，把图片信息对象，从 pics 数组中移除
      this.addForm.pics.splice(remFileIndex, 1);
      //console.log(this.addForm);
    },
    //监听图片上传成功的事件
    handleSuccess(response) {
      //拼接得到一个图片信息列表
      const picInfo = { pic: response.data.tmp_path };
      //将图片信息对象 push 到 pics 数组中
      this.addForm.pics.push(picInfo);
      //console.log(this.addForm.pics);
    },
    //添加商品
    addGoods() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) {
          return this.$message.error("请填写必须的表单项！");
        }
        //执行添加的业务逻辑
        //深拷贝addForm
        const deepForm = _.cloneDeep(this.addForm);
        deepForm.goods_cat = deepForm.goods_cat.join(",");
        //console.log(deepForm);
        //处理动态参数
        this.manyTabData.map((item) => {
          const newManyInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(" "),
          };
          this.addForm.attrs.push(newManyInfo);
        });
        //处理静态属性
        this.onlyTableData.map((item) => {
          const newOnlyInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals,
          };
          this.addForm.attrs.push(newOnlyInfo);
        });
        deepForm.attrs = this.addForm.attrs;
        //发起请求添加商品
        const { data: res } = await this.$http.post("goods", deepForm);
        if (res.meta.status !== 201) {
          return this.$message.error("添加商品失败！");
        }
        this.$message.success("添加商品成功！即将跳转");
        setTimeout(
          function () {
            this.$router.push("/goods");
          }.bind(this),
          3000
        );
      });
    },
  },
  computed: {
    //定义三级分类的id
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }
    },
  },
};
</script>

<style lang="less" scoped>
.goods-form {
  text-align: left;
}
.el-input {
  width: 520px;
}
.el-checkbox {
  margin: 0 8px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
  float: right;
}
</style>
